TM 9-2320-364-20-22-1079(1) Push down on radiator cap and slowly turn to left to relieve pressure fromradiator.(2) Start engine (TM 9-2320-364-10).Allow engine to warm to operatingtemperature of 190°F (88°C).(3) Inspect coolant flow in radiator.(a) If coolant does not flow,perform Steps (4) and (5) below and replace thermostat(s) (Para 6-7).(b) If coolant does flow, thermostat(s) is OK.(4) Turn OFF ENGINE switch.(5) Install radiator cap on radiator.THERMOSTAT TESTDo not remove the radiator cap when the engine is hot; steam and hot coolant can escape and burn personnel.Use a clean, thick waste cloth or like material to remove the cap. Avoid using gloves. If hot water soaks through gloves, personnel could be burned.